Ohm’s law is the mathematical relationship among electric current, resistance and voltage. The principle is named after the German scientist Georg Simon Ohm. Ohm demonstrated that there are no "perfect" electrical conductors through a series of experiments in 1825. Every conductor he tested offered some level of resistance. These experiments led to Ohm’s law. Ohm’s law of 1826 states that if the given temperature remains constant, the current flowing through certain conductors is proportional to the potential difference (voltage) across it. In other words, current equals voltage divided by resistance.

How Voltage,Current Resistance relates 
An electric circuit is formed when a conductive path is created to allow free electrons to continuously move. This continuous movement of free electrons through the conductors of a circuit is called a current, and it is often referred to in terms of "flow," just like the flow of a liquid through a hollow pipe.

Ohm’s Law states that the current through a conductor between two points is directly proportional to the potential difference across the two points, and inversely proportional to the resistance between them.

One the most important and fundamental laws of electronics is that of ohms law. This law defines the relationships between current, voltage and resistance. A good way to understand ohms laws is an analogy with a domestic water system. The same way that an electric current flows through a copper wire, water flows through a copper pipe in a water system. Most people do not think to much about the fact but when they turn on tap the water comes out as a result of the pressure that is provided  by a pumping station some miles away. This water pressure is similar to that used to drive electricity around a circuit, the potential difference or pd for short is the term that is used - this is measured in volts.

An emf source of 6.0V is connected to a purely resistive lamp and a current of 2.0 amperes flows. All the wires are resistance-free. What is the resistance of the lamp?

When a voltage is applied to a complete circuit current begins to flow. In electrical circuits, the function of a resistor generally is to limit the flow of that current. When current flows through a resistor, energy is converted from electrical energy into heat energy, and a potential difference or voltage appears across the leads of the resistor. The voltage across your sample will be studied as a function of the current flow in the circuit.

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